Description: Regular Ball Super Ball Create a class Ball. Ball objects should accept one argument for "ball type" when instantiated. If no arguments are given, ball objects should instantiate with a "ball type" of "regular."…

0. demo 在拓扑学上,open set(开集)是对实数轴(real line)上开区间(open interval)的拓展. 红色圆盘:{(x,y)|x2+y2<r2},蓝色圆圈:{(x,y)|x2+y2=r2} 红色点集即为一种 open set,蓝色点集则为 boundary set, 红色点集和蓝色点集的并构成了 closed set: 1. interior point 与 limit point 度量空间 (X,d) 中的任一子集 S,x 如果想成为 S 中的一个内点,则要求,存…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=5821 有n个盒子,每个盒子最多装一个球. 现在进行m次操作,每次操作可以将l到r之间盒子的球任意交换. 问进行上述操作后,是否能变成指定的状态. 将颜色相同的球,尽量靠最终状态近的分配.对于每次操作 按最终序号靠近进行排序.最后检查是否一致就行了. 官方题解:假设有4个红球,初始时从左到右标为1,2,3,4.那么肯定存在一种方案,使得最后结束时红球的顺序没有改变,也是1,2,3,4. 那么就可以把同…

Ball 题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=5821 Description ZZX has a sequence of boxes numbered 1,2,...,n. Each box can contain at most one ball. You are given the initial configuration of the balls. For 1≤i≤n, if the i-th box is empty the…

Closed Fences A closed fence in the plane is a set of non-crossing, connected line segments with N corners (3 < N < 200). The corners or vertices are each distinct and are listed in counter-clockwise order in an array {xi, yi}, i in (1..N). Every pa…

T1 ball 可以发现每次推动球时,是将每个球的位置 −1-1−1 ,然后把最左边的球放到 P−1P-1P−1 处. 记个 −1-1−1 次数,再用set维护就好了. #include <bits/stdc++.h> using namespace std; int n, q, p, now; set<int>ball; inline void read(int &num) { char ch; num = 0; int flag = 1; while((ch=getch…

Finally, we'll want a way to test whether a file we've opened is closed. Sometimes we'll have a lot of file objects open, and if we're not careful, they won't all be closed. How can we test this? f = open("bg.txt") f.closed # False f.close() f.c…

<Differential Geometry of Curves and Surfaces> by Manfredo P. do Carmo real line Rinterval I==============================================CH1 CurvesDEFINITION. A parametrized differentiable curve is a differentiable map a: I --> R3 of [an open in…

1 hadoop conf.addResource http://stackoverflow.com/questions/16017538/how-does-configuration-addresource-method-work-in-hadoop How does Configuration.addResource() method work in hadoop up vote down vote favorite Does Configuration.addResource() meth…

<Differential Geometry of Curves and Surfaces> by Manfredo P. do Carmo real line Rinterval I==============================================CH1 CurvesDEFINITION. A parametrized differentiable curve is a differentiable map a: I --> R3 of [an open in…